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I am not saying this is the case concerning your outdrive in particular BUT, often there are other options from different manufacturers, read the specs then find another that meets or exceeds those specs set by Volvo. A manufacturer cannot demand you use only their product but, using a product that does not meet requirements for warranty or reliability is whole 'nother mess.

Where you may be stuck is if there are no alternatives, in rare cases only the manufacturer brand is the only one to meet spec, therefor, you are stuck until/unless the aftermarket puts something out there.

It should be easy enough to punch in the specs online and find another, or no, alternatives.

I used to buy 5gal pails of outdrive oil at the outfit that sells fuel,oil & filters down in the anchorage harbor. Like i said in another post my drive had 11,000 hours on it when i sold the boat and their oil was all i ever used in it. By the way i only changed the oil in the drive once a year.

With my old Volvo 290 drives I used Valvoline syn gear oil, now with my new DPH-C I use the volvo transmission oil in 75-140, I been changing oil every 100hrs, and its been coming out like new so I'm going to look at it and change if need be at 120hrs, then 150hrs. I have a light boat 14,000lbs with a single 370hp volvo.